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{{Short description|Geologic formation in Bolivia}}
{{Infobox rockunit
{{Infobox rockunit
| name = Yecua Formation
| name = Yecua Formation
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| period = Miocene
| period = Miocene
| age = [[Langhian|Late Langhian]]-[[Messinian|Early Messinian]]<br />([[Colloncuran]]-[[Huayquerian]])<br />~{{fossil range|14|7}}
| age = [[Langhian|Late Langhian]]-[[Messinian|Early Messinian]]<br />([[Colloncuran]]-[[Huayquerian]])<br />~{{fossil range|14|7}}
| prilithology = [[Mudstone]], [[Sandstone]]<ref name=Marshall1993>{{Cite journal|last1=Marshall|first1=L.G.|last2=Sempere|first2=T.|last3=Gayet|first3=M.|year=1993|title=The Petaca (Late Oligocene - Middle Miocene) and Yecua (Late Miocene) Formations of the Subandean-Chaco Basin, Bolivia, and their Tectonic Significance|journal=Travaux et Documents des Laboratoires de Géologie de Lyon| volume=125| pages= 291-301}}</ref>
| prilithology = [[Mudstone]], [[Sandstone]]<ref name=Marshall1993>{{Cite journal|last1=Marshall|first1=L.G.|last2=Sempere|first2=T.|last3=Gayet|first3=M.|year=1993|title=The Petaca (Late Oligocene - Middle Miocene) and Yecua (Late Miocene) Formations of the Subandean-Chaco Basin, Bolivia, and their Tectonic Significance|journal=Travaux et Documents des Laboratoires de Géologie de Lyon| volume=125| pages= 291–301}}</ref>
| otherlithology = [[Gypsum]]
| otherlithology = [[Gypsum]]
| namedfor =
| namedfor =
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}}
}}


The Yecua Formation is a geological Formation in what is now [[Bolivia]]. Studies suggest that the Yecua Formation preserves a coastal setting with humid to semiarid floodplains, shorelines and tidal as well as shallow marine environments including marshes, streams, lakes and brackish bodies of water. There may have been a connection to the [[Amazon Basin]] or the [[Paranaense Sea]].<ref name=Hulka06>{{Cite journal|last1=Hulka|first1=C.|last2=Gräfe|first2=K.U.|last3=Sames|first3=B.|last4=Uba|first4=C.E.|last5=Heubeck|first5=C.|year=2006|title=Depositional setting of the Middle to Late Miocene Yecua Formation of the Chaco Foreland Basin, southern Bolivia|journal=Journal of South American Earth Sciences| volume=21| pages= 135-150|doi=10.1016/j.jsames.2005.08.003}}</ref>
The '''Yecua Formation''' is a geological Formation in what is now [[Bolivia]]. Studies suggest that the Yecua Formation preserves a coastal setting with humid to semiarid floodplains, shorelines and tidal as well as shallow marine environments including marshes, streams, lakes and brackish bodies of water. There may have been a connection to the [[Amazon Basin]] or the [[Paranaense Sea]].<ref name=Hulka06>{{Cite journal|last1=Hulka|first1=C.|last2=Gräfe|first2=K.U.|last3=Sames|first3=B.|last4=Uba|first4=C.E.|last5=Heubeck|first5=C.|year=2006|title=Depositional setting of the Middle to Late Miocene Yecua Formation of the Chaco Foreland Basin, southern Bolivia|journal=Journal of South American Earth Sciences| volume=21|issue=1–2 | pages= 135–150|doi=10.1016/j.jsames.2005.08.003|bibcode=2006JSAES..21..135H }}</ref>


==Bivalves==
==Bivalves==
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|
|
|-
|-
|cf. ''[[Astarte]]''<ref name=Marshall1993/>
|cf. ''[[Astarte (bivalve)|Astarte]]''<ref name=Marshall1993/>
|cf. ''A. sp''
|cf. ''A. sp''
|
|
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|
|
|-
|-
|cf. ''[[Lucina]]''<ref name=Marshall1993/>
|cf. ''[[Lucina (bivalve)|Lucina]]''<ref name=Marshall1993/>
|cf. ''L. sp''
|cf. ''L. sp''
|
|
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|
|
|-
|-
|''[[Senis]]''<ref name=Marshall1993/>
|''[[Senis (bivalve)|Senis]]''<ref name=Marshall1993/>
|''S.'' cf. ''elongatus''
|''S.'' cf. ''elongatus''
|
|
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|-
|-
|}
|}



==Gastropods==
==Gastropods==
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! Material
! Material
! Notes
! Notes
! Image
|-
|-
|cf. ''[[Theosodon]]''<ref name=Marshall1993/>
|cf. ''[[Theosodon]]''<ref name=Marshall1993/>
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|
|
|distal limb bone
|distal limb bone
|a [[Litopterna|litopternan]]
|a [[litopterna|litoptern]]
|[[File:Theosodon NT.jpg|thumb]]
|-
|-
|''[[Rodentia|Rodentia indet.]]''<ref name=Marshall1993/>
|''[[Rodentia|Rodentia indet.]]''<ref name=Marshall1993/>
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|
|
|-
|-
|''[[Mourasuchus]]''<ref name=Tineo2015_p4>{{cite LSA |last=Tineo |first=D.E. |last2=Bona |first2=P. |last3=Pérez |first3=L.M. |last4=Vergani |first4=G.D. |last5=González |first5=G. |last6=Poiré |first6=D.G. |last7=Gasparini |first7=Z. |last8=Legarreta |first8=P. |year=2015 |title=Palaeoenvironmental implications of the giant crocodylian ''Mourasuchus'' (Alligatoridae, Caimaninae) in the Yecua Formation (late Miocene) of Bolivia |url=https://www.researchgate.net/publication/271702404_Palaeoenvironmental_implications_of_the_giant_crocodylian_Mourasuchus_Alligatoridae_Caimaninae_in_the_Yecua_Formation_late_Miocene_of_Bolivia |journal=[[Alcheringa (journal)|Alcheringa]] |volume=39 |pages=1–12}}</ref>
|''[[Mourasuchus]]''<ref name=Tineo2015_p4>{{cite journal |last1=Tineo |first1=D.E. |last2=Bona |first2=P. |last3=Pérez |first3=L.M. |last4=Vergani |first4=G.D. |last5=González |first5=G. |last6=Poiré |first6=D.G. |last7=Gasparini |first7=Z. |last8=Legarreta |first8=P. |year=2015 |title=Palaeoenvironmental implications of the giant crocodylian ''Mourasuchus'' (Alligatoridae, Caimaninae) in the Yecua Formation (late Miocene) of Bolivia |url=https://www.researchgate.net/publication/271702404 |journal=[[Alcheringa (journal)|Alcheringa]] |volume=39 |issue=2 |pages=1–12|doi=10.1080/03115518.2015.967162 |bibcode=2015Alch...39..224T |hdl=11336/33274 |s2cid=129930697 |hdl-access=free }}</ref>
|''M. sp.''
|''M. sp.''
|
|
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|
|
|-
|-
|''[[Humboldtichthys]]''<ref name=Albert10>{{Cite journal|last1=Albert|first1=J.S. |last2=Fink|first2=W.L.|year=2010 |title= Phylogenetic relationships of fossil neotropical electric fishes (Osteichthyes: Gymnotiformes) from the upper Miocene of Bolivia|journal=Journal of Vertebrate Paleontology| volume=27|issue=1| pages= 17-25|doi=10.1671/0272-4634(2007)27[17:PROFNE]2.0.CO;2}}</ref>
|''[[Humboldtichthys]]''<ref name=Albert10>{{Cite journal|last1=Albert|first1=J.S. |last2=Fink|first2=W.L.|year=2010 |title= Phylogenetic relationships of fossil neotropical electric fishes (Osteichthyes: Gymnotiformes) from the upper Miocene of Bolivia|journal=Journal of Vertebrate Paleontology| volume=27|issue=1| pages= 17–25|doi=10.1671/0272-4634(2007)27[17:PROFNE]2.0.CO;2|s2cid=35007130 }}</ref>
|''Humboldtichthys kirschbaumi''
|''Humboldtichthys kirschbaumi''
|
|
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==References==
==References==
{{Reflist}}
{{Reflist}}

[[Category:Geologic formations of Bolivia]]
[[Category:Miocene Series of South America]]
[[Category:Huayquerian]]
[[Category:Chasicoan]]
[[Category:Mayoan]]
[[Category:Laventan]]
[[Category:Friasian]]
[[Category:Colloncuran]]
[[Category:Neogene Bolivia]]
[[Category:Fossiliferous stratigraphic units of South America]]
[[Category:Paleontology in Bolivia]]
[[Category:Sandstone formations]]
[[Category:Mudstone formations]]
[[Category:Lacustrine deposits]]

Latest revision as of 12:33, 12 June 2024

Yecua Formation
Stratigraphic range: Late Langhian-Early Messinian
(Colloncuran-Huayquerian)
~14–7 Ma
UnderliesTariquia Formation
OverliesPetaca Formation
Thickness~50–300 m (160–980 ft)
Lithology
PrimaryMudstone, Sandstone[1]
OtherGypsum
Location
RegionChaco Basin
Country Bolivia

The Yecua Formation is a geological Formation in what is now Bolivia. Studies suggest that the Yecua Formation preserves a coastal setting with humid to semiarid floodplains, shorelines and tidal as well as shallow marine environments including marshes, streams, lakes and brackish bodies of water. There may have been a connection to the Amazon Basin or the Paranaense Sea.[2]

Bivalves

[edit]
Name Species Member Material Notes
Tellina[1] T. sp
cf. Cyrena[1] cf. C. sp
cf. Astarte[1] cf. A. sp
cf. Lucina[1] cf. L. sp
Senis[1] S. cf. elongatus
cf. Corbula or Cymbophora sp.[1] cf. C. sp
cf. Nucula[1] cf. N. sp

Gastropods

[edit]
Name Species Member Material Notes
cf. Gyrodes or Natica sp.[1]
cf. Turritella[1] cf. T. sp

Crustaceans

[edit]
Name Species Member Material Notes
Bythocypris[1] B. sp
Cyprideis[1] C. sp
cf. Balanus[1] cf. B. sp
indetermined crabs [1]

Vertebrates

[edit]
Name Species Member Material Notes Image
cf. Theosodon[1] cf. T. sp distal limb bone a litoptern
Rodentia indet.[1] tooth
Mourasuchus[3] M. sp. skull fragments, partial vertebrae & ribs
Pleurodira[3] shell elements
Humboldtichthys[4] Humboldtichthys kirschbaumi incompletely preserved anterior portion of the body and posterior head a Glass Knifefish
Siluriformes indet.[1] possibly Ariidae
Characiformes or Clupeiformes[1] a scale

References

[edit]
  1. ^ a b c d e f g h i j k l m n o p q r Marshall, L.G.; Sempere, T.; Gayet, M. (1993). "The Petaca (Late Oligocene - Middle Miocene) and Yecua (Late Miocene) Formations of the Subandean-Chaco Basin, Bolivia, and their Tectonic Significance". Travaux et Documents des Laboratoires de Géologie de Lyon. 125: 291–301.
  2. ^ Hulka, C.; Gräfe, K.U.; Sames, B.; Uba, C.E.; Heubeck, C. (2006). "Depositional setting of the Middle to Late Miocene Yecua Formation of the Chaco Foreland Basin, southern Bolivia". Journal of South American Earth Sciences. 21 (1–2): 135–150. Bibcode:2006JSAES..21..135H. doi:10.1016/j.jsames.2005.08.003.
  3. ^ a b Tineo, D.E.; Bona, P.; Pérez, L.M.; Vergani, G.D.; González, G.; Poiré, D.G.; Gasparini, Z.; Legarreta, P. (2015). "Palaeoenvironmental implications of the giant crocodylian Mourasuchus (Alligatoridae, Caimaninae) in the Yecua Formation (late Miocene) of Bolivia". Alcheringa. 39 (2): 1–12. Bibcode:2015Alch...39..224T. doi:10.1080/03115518.2015.967162. hdl:11336/33274. S2CID 129930697.
  4. ^ Albert, J.S.; Fink, W.L. (2010). "Phylogenetic relationships of fossil neotropical electric fishes (Osteichthyes: Gymnotiformes) from the upper Miocene of Bolivia". Journal of Vertebrate Paleontology. 27 (1): 17–25. doi:10.1671/0272-4634(2007)27[17:PROFNE]2.0.CO;2. S2CID 35007130.
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